another rune

[moebius2.git] / mgraph.h

diff --git a/mgraph.h b/mgraph.h
index 4ab020585b8e57609cbff0808aedbc2f1dc54d27..06c53e214ec1f5cac09a151f827b8caaf7344b77 100644 (file)
--- a/mgraph.h
+++ b/mgraph.h
@@ -125,9 +125,7 @@ int edge_reverse(int v1, int e);
   for ((vy)=0; (vy)<Y; (vy)+=Y-1)                              \
     for ((vx)=0; (v)= (vy)<<YSHIFT | (vx), (vx)<X; (vx)++)
 
-#define VERTICES_SPAN_JOIN_P(v0,v1)            \
-  /* v0 and v1 must be (nearly) adjacent */    \
-  (!!((v0) ^ (v1) ^ (1<<(XBITS-1))))
+int vertices_span_join_p(int v0, int v1);
 
 typedef double Vertices[N][D3];
 struct Vertices { Vertices a; };